<template>
  <div class="row">
    <div v-for="column in list" :key="column.id" class="col-4 mb-4">
      <div class="card h-100 shadow-sm">
        
        <div class="card-body text-center">
          <img src="./../assets/logo.png" :alt="column.title" class="rounded-circle border border-light w-25 my-3">
          <h5 class="card-title">{{ column.title }}</h5>
          <p class="card-text text-left">{{ column.description }}</p>
          <router-link :to="`/column/${column.id}`" class="btn btn-outline-primary">进入专栏</router-link>
        </div>
        
      </div>
    </div>
  </div>
</template>

<script lang="ts">
import { computed, defineComponent,PropType} from 'vue'
export interface ColumnProps{
  id: number;
  title: string;
  avatar?: string;
  description: string;
}
export default  defineComponent({
  name:'ColumnList',
  props:{
    list:{
      type:Array as PropType<ColumnProps[]>,
      required: true
    },
  },
  setup(props){
    const columnList = computed(()=>{ 
      return props.list.map(column =>{
        if(!column.avatar){
          column.avatar = require('@/assets/logo.png')
        }
        return column 
      })
    })
    return {
      columnList
    }
  }
})
</script>

<style>

</style>